Cellular cushion tire of rubber for vehicle wheels



Sept. 26, 1933. J. BRUNSWICK 12,52 v

' CELLULAR CUSHION TIRE OF RUBBER FOR VEHICLE WHEELS Filed April 23,1.931 2 Sheets-Sheet 1 Sept. 26, 1933. J. BRUNSWICK r 1,923,524?

CELLULAR CUSHION TIRE OF RUBBER FOR VEHICLE WHEELS Filed April 25, 1951I Y 2 Sheets-Sheet 2 "gal mmi! l llql ateeol Set. 26,

means I Application d g 23, 1931, i

This invention relates to improvements in cellular cushion tires ofrubber for vehicle wheels adapted to impart increased capacity forresistance and increased resiliency to such tires so as 5 to renderpossible increase of load on the tires notwithstanding the presence ofobstacles and iiregularities oi the track.

Among cellular tires heretofore known and proposed are tires havingtransverse partitions parallel to one another, and separated byintervals or gaps forming cells. If these tires are subjected to a loadwhich is fairly heavy in relation to their section, they are liable toflatten during therolling movement, which causes crushing and tilting ofthe transverse partitions; there results considerable wear by frictionof .the surfaces rubbing on one another as well as heating, whichdetracts from the capacity for resistance of the rubber. I

The invention obviates these drawbacks and ensures better stabilitywithout the resilience, while preventing tilting and contact of thetransverse partitions.

' With the above object in view'the transverse partitionsareinterconnected by longitudinal partitions substantially perpendicularto the transverse partitions and forming therewith a cellular structureobtained by .moulding rubber under high pressure; the cohesion of thisstructure is such that the tire has a uniform resilience and displays noweak point.

In order to obtain regular and precise binding together of the severalmoulded rubber partitions,

it is necessary to ,form all the parts in special moulds from thegeneral description of which there will' be readily understood thepossibility of r the herein described complex cellular system. I

In order to leave no doubt regarding the nature of the invention thereare described below several embodiments by way of example only withreference to the accompanying drawings in which;

Fig. 1 is a transverse section 01' a tire according to the invention.

Fig. 2 is a perspective view partly in section of this tire.

3 shows in perspective the core of a mould 'for forming the tire shownin Figs. land 2.

Figs. 4 and 5 are developed views showing partitions on the internalsurface of the'tire, representing diflerent modes. of interconnectingthe partitions.

Fig. 6 is a perspective view in transverse section of anothermodification incorporating means for 55 placing the partitions underpermanent tension.

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Fig. 7 is a perspective view also in transverse section showing afurther modification.

' Referring to Figs. 1 and 2, there are shown at 1 the transversepartitions formed in how manner in the interior of thecellular tire 2held by flexible tension members 3 to the rim 4; as shown,

- the partitions 1 enclose a central cavity 5 (Fig. 1).

According to the invention the transverse partitions 1 areinterconnected by longitudinal partitions of which preferably lateralpartitions 6 extend inwardly to the cavity 5 and of which otherpartitions 7 stop short-of the cavity 5; the assembly thus includes twosets of partitions which in the example illustrated intersect at rightangles and define the boundaries of cells of rectangular section.

Fig. 3 illustrates the principal element or core of the mould forproducing the cavities and recesses intended to form the profiles oi thepartitions 1, 5 and '1; this core is utilized in conjunction with two ormore metallic envelopes or shells which define the exterior surface ofthe tire.

The segment shown in Fig. 3 forms part of a torus formed from a steelblank A and profiled by turning in manner to give it the appearanceindicated at 8 where there are seen the profiles 6a and 7a of thelongitudinal circular partitions 6 and 7.. To provide for theproduction-of the transverse partitions 1 there are formed in the blankA by milling or otherwise transverse grooves 1 of appropriate shape. Thetorus is divided and adjusted in usual manner in order to permit removalfrom the mould of the cellular tire obtained after the latter has beensubjected to the operation of vulcanizing the rubber.

It should be understood that; without departure from the scope of theinvention, modifications may be made in the structure, that there may beutilized for the realization oi the invention any suitable materials,and that, further, the forms may be varied while satisfying theconditions and obtaining the object sought.

Thus, as is shown in 4, internal longitudinal partitions .6 may projectfurther inwardly than the transverse partitions 1, or may inpart projectfurther inwards as at 6, while the other longitudinal partitions 7project inwards to the same extent, and the partitions 7 project inwardsto less extent than the transverse partitions 1 (Fig. 5).

Obviously, the partitions may be otherwise interconnected, for example,obliquely, so that there may be combined with the forms of cellulartires above described hiown means adopted in the formation of tires,such as wires, ordinary woven fabric, or fabric woven on the bias as at1'7.

. More particularly and according to Figs. 6 and 7 there may beprolonged towards the base one or more of the longitudinal partitions,for example, in Fig. 6 and '7 in Fig. 7. The partitions 7 and 'l arearmoured at their lower part with an extensible member 9 of hard steelwire coiled in spiral'form.

This armouring has for its object to maintain the partitions '7 and 7 ina state of constant tension while the tire is in place on the rim.Fitting in place brings about a certain elastic tension of the armouring9 as well as of the members 3 and this state 01 tension of thelongitudinal partitions 7 and 'I is communicated tothe transversepartitions 1 and gives to the whole a rigidity which enables it toresist efforts to which it is subjected when rolling on the ground. Thearmouring members 9 are embodied in the longitudinal partitions 7 and 'lwhich are preferably lined with a bias woven fabric as indicated at 17.

the armoured longitudinal partitions 7 and 7 may be combined withnon-recessed transverse partitions 1 which isolate completely theseveral cells.

What is claimed is:-

1. A cellular cushion tire of rubber for vehicle wheels, having, incombination, moulded internal transverse partitions and longitudinalinternal partitions, the walls and cells thus formed bein sufficientlyclosely spaced to reinforce each other,

- and the cells being open to the interior of the tire. 2. A cellularcushion tire according to claim 1 in which the central longitudinalpartitions proiect inwardly at least as far as the transversepartitions.

3. A cellular cushion tire according to claim 1 .in which the centrallongitudinal partitions pro- .ject inwardly less than the transversepartitions.

4. A cellular cushion tire according to claim 1 having one or more ofthe central longitudinal partitions projecting inwardly beyond theinternal transverse partitions, said longitudinal partitions beingprolonged towards the base of the tire and armoured.

4 JULES BRUNSWICK.

